$$\frac{-7}{5}\times(\frac{-15}{21}-\frac{35}{49})$$
$2$
$$-\frac{7}{5}\left(\frac{-15}{21}-\frac{35}{49}\right)$$
$$-\frac{7}{5}\left(-\frac{5}{7}-\frac{35}{49}\right)$$
$$-\frac{7}{5}\left(-\frac{5}{7}-\frac{5}{7}\right)$$
$$-\frac{7}{5}\times \frac{-5-5}{7}$$
$$-\frac{7}{5}\left(-\frac{10}{7}\right)$$
$$\frac{-7\left(-10\right)}{5\times 7}$$
$$\frac{70}{35}$$
$$2$$
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